Conclusions Echocardiography can be used in diagnosis and approximate classification of TPVAD, in judgement of pulmonary venous drainage block and in prediction of the prognosis of patients.
结论应用超声心动图可确定该病的诊断和大致分型，判断肺静脉回流梗阻的有无及预后。
Petroleum exploration and development call for not only the intensive study and prediction of ground stresses but also simple, economical and practical approximate methods.
在油气的勘探与开发过程中既需要精细的地应力研究与预测，也需要简单易行、经济实用的近似方法。
Highway traffic noise prediction model is deduced and analyzed. It is indicated that the FHWA model originating from USA Federal Highway Administration is an approximate representation.
对公路交通噪声预测模型进行了分析推导，指出美国联邦公路局FHWA模型为近似表达式，并给出了精确表达式。
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